<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <input type="text" id="input" onkeypress="fn()">
  <script src="./index.js"></script>
  <script>
    fn = throttle(function () {
      console.log(input.value)
    }, 1000);
  </script>
</body>
</html>